Air Squared is the industry leader in oil-free scroll compressor design and manufacturing. By introducing a simple and elegant design with fewer moving parts, scroll compressor technology offers OEM applications an oil-free, ultra-quiet and smooth-operating alternative to traditional reciprocating, diaphragm, and vain technology.

Air Squared, Inc. was founded in 1991 to service the needs of OEMs with oil-free scroll solutions for demanding positive displacement applications. Twenty years later, Air Squared is the industry leader in oil-free scroll design and manufacturing, with more experience and more scroll compressor models than any other company.

Range Capability Overview

Flow Rates 100 – 3,000 lpmv
Pressures 5 – 15 barg

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Qualified OEMs should consult Air Squared for custom configurations and application specific requirements.

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Scroll Compressor Solutions from Air Squared

Find your oil-free solution through a growing line of liquid-cooled scroll compressors engineered specifically for OEMs and view past projects that supported liquid-cooled scroll technology development

While liquid cooling for oil-free and lubricated scroll compressor has been investigated in the past, patented liquid-cooled scroll technology from Air Squared offers the first oil-free scroll compressor design that provides effective cooling to both the fixed scroll and orbiting scroll. The patented technology allows coolant to be transferred between the fixed scroll and orbiting scroll without the use of dynamic seals.

Air-cooled scroll compressor designs are pressure-limited because the heat generated during compression causes the primary working components to thermally expand. The thermal expansion causes interference between the fixed scroll and orbiting scroll, eventually leading to mechanical failure. While the running clearance between the fixed scroll and orbiting scroll can be increased to avoid interference, this approach also decreases volumetric efficiency and pressure capability.

Liquid cooling allows for significantly more control over operating temperatures throughout the compression process. By removing heat generated during the compression process more effectively, thermal expansion is mitigated, allowing for high-pressure operation without sacrificing efficiency or reliability.

Sealed and Semi-hermetic configurations

Compared to air-cooled compressor designs, liquid cooling offers isolation of working fluid to ambient and drive componentry (i.e. motor). Air-cooled compressors cool the fixed scroll and orbiting scroll with ambient air. While this approach is adequate with an open-housing design, air colling is far less effective if the compression process is fully enclosed (e.g. sealed or semi-hermetic). Liquid-cooling solves this issue by providing effective cooling to the fixed scroll and orbiting scroll, even if the compressor is semi-hermetically sealed.

Liquid colling also operates independently of ambient conditions. This allows for effective cooling, even if the compressor is exposed to elevated ambient temperatures – as in under-the-hood vehicle applications.

For operation with flammable gases, such as O2 and H2, the “independent drive” series of liquid-cooled scroll compressors are easily configured with a magnetic coupling that fully isolates the working fluid from the motor.

Scroll Compressor Related Articles

Scroll Compressor FAQs

Monitoring speed is an important aspect of operating a scroll compressor or vacuum pump, as operation over the specified maximum speed can result in premature or catastrophic failure.

For scroll compressors and vacuum pumps that have a brushless DC motor, speed can be measured by connecting a digital tachometer between a hall sensor and ground. The tachometer must be programmed to the correct number of pulses per revolution, which can be determined by dividing the numbers of motor poles by 2. For example, an 8-pole motor will have 4 pulses per revolution. Alternatively, an oscilloscope can also be used to measure the frequency of the hall sensors. Divide the measured frequency by the number of pulses per revolution and multiply by 60 to determine the RPM. For scroll compressors and vacuum pumps that have an AC motor, speed can be measured by multiplying the frequency of the variable frequency drive (VFD) by 60 to determine the RPM.

Air Squared does not provide operation manuals for most products.

Given the specialized nature of our scroll products, Air Squared works directly with OEM customers to install, operate, test, evaluate, and service products. Customers who require an operation manual should contact their Sales Representative.

If you do not have a Sales Representative, start with our Application Assistant or contact Sales directly.

Application Assistant

Looking at the face of the unit, the motor shaft for scroll compressors and scroll vacuum pumps rotates clockwise.

Most Air Squared products do not have a CE conformity marking.

Our products are primarily designed for OEMs and not intended for end users. As most OEM systems already require CE marking, conformity specific to an Air Squared product is generally not required.

OEM customers that require conformity specific to an Air Squared product should contact their Sales Representative.

Most scroll compressors have a discharge port centered on the face of the unit, with the inlet port positioned near the periphery.

Scroll Compressor News

Air Squared Part of Cross-Industry Collaboration Developing Hybrid Power Generation System

November 09, 2018

Broomfield, CO – A collaboration between Colorado School of Mines, Colorado State University, Kohler Power Systems, and Air Squared, has been awarded $3 million in funding from the Advanced Research Projects Agency-Energy (ARPA-E) to develop a novel hybrid power generation system. Led by Professor Rob Braun at Colorado School of Mines, the team is one […]

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Cost Barriers Shattered with Low-Cost Pump Development

September 01, 2017

Broomfield, CO — With support from the U.S. Department of Energy (DOE), Air Squared is developing low-cost scroll technology that opens up markets previously too cost-sensitive to justify the advantages of oil-free scroll compressors and vacuum pumps. The Advanced Research Projects Agency – Energy (ARPA-E) requires a very specific low-cost natural gas compressor as part […]

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NASA Funds Multi-Stage Scroll Compressor Technology

May 05, 2017

Broomfield, CO — Air Squared has been awarded Phase I Small Business Innovation Research (SBIR) funding through the National Aeronautics and Space Administration (NASA) under the topic Mars Atmosphere Acquisition, Separation, and Conditioning for In Situ Resource Utilization (ISRU). The SBIR award follows Air Squared’s work with the Jet Propulsion Laboratory (JPL) on the Mars […]

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Air Squared Awarded Contract to Develop Scroll Compressor in NASA MOXIE Demonstration Unit for Mars 2020 Mission

February 02, 2016

Broomfield, CO – After finishing an extensive paper study that evaluated the feasibility of designing a scroll compressor for the Jet Propulsion Laboratory (JPL), Air Squared, Inc. has been awarded a contract to develop two CO2 scroll compressor designs that will be used in the Mars Oxygen ISRU Experiment (MOXIE) technology demonstration experiment for the […]

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NASA Outreach Program Assists Air Squared

March 26, 2012

New compressor design heads to production thanks to assistance from NASA outreach program.

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Plug Power Places Large Production Order

October 27, 2011

Plug Power places large production order for Air Squared compressors used in GenDrive fuel cell units.

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Air Squared in Machine Design

September 19, 2011

Machine Design has recently featured an article introducing Air Squared’s P6H8N3.0 miniature scroll compressor.

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100 lpm, 100 psi Scroll Compressor

September 04, 2011

Developed for use in testing pilot suits, the compressor will be ideal for dental applications.

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Development for Fuel Cell Recirculation Pumps

August 12, 2011

High-reliability oxygen and hydrogen fuel cell recirculation pumps for a lighter-than-air aircraft application.

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Miniature Compressor Development Complete

February 12, 2011

Air Squared has finished development on the first scroll-type, continuous-duty, high-efficiency miniature compressor.

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Semi-hermetic Scroll Compressor

June 04, 2006

New semi-hermetic scroll compressor and vacuum pump delivers 80% volumetric efficiency with smooth, quiet operation.

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Air Squared Helps Inogen Oxygen Concentrator

March 04, 2005

Rotary scroll compressor helps new Inogen One oxygen concentrator break sound, weight, and battery-life barriers.

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Introducing the World’s Smallest Scroll Compressor

November 01, 2003

Air Squared introduces the world’s smallest scroll air compressor/pump for medical equipment, fuel cells, mass spectrometers.

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Tapping Scroll Technology for Pulse-free Air

January 01, 2002

New oil-free 0.5 hp compressor and vacuum pump taps clean, reliable scroll technology for pulse-free air in medical devices.

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Scroll Compressor Projects

Oil-Free Scroll Refrigeration Compressor for Aerospace

April 02, 2019

Environmental Control Systems (ECS) regulate sensitive electronics cooling, bleed air control, cabin pressure, and auxiliary systems in modern defense and civilian aircraft. Most systems use complex distributed rotary-vane and screw compressors that are constrained by intricate duct systems that compromise size, weight, and power. The P13H025A-BLDC-SH represents a compact and lightweight alternative with a superior […]

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Two-Stage Scroll Compressor for Vapor Compression Refrigeration

January 21, 2019

Designed as the driving compressor in the innovative Zero-Gravity Vapor Compression Refrigerator for space-bound food storage, the two-stage and semi-hermetic P07T013A-BLDC-C-SH scroll compressor is adaptable for several commercial refrigeration applications. The semi-hermetic housing facilitates compatibility with different working fluids, including air, inert gases, and refrigerants. The Two-stage design minimizes size and power requirements while maximizing […]

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Second Generation Semi-Hermetic Scroll Compressor

October 10, 2018

Compatible with a range of working fluids at flow rates over 400 lpm, the second generation P22H038B-AC-SH offers a number of improvements to a design Air Squared first released over a decade ago. The second generation design has improved heat dissipation and a larger cooling fan for reliable performance during extended operation. The second generation […]

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Quiet, High-Pressure Compressor for Commercial EV

April 28, 2018

Air Squared has completed development of a liquid-cooled scroll compressor for a commercial electric vehicle application. The application required a durable, oil-free compressor capable of delivering 150 lpmv at 10.5 barg. A major source of noise for EV applications is the compressor used in the air-braking system, so quiet operation was also a critical requirement. […]

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Liquid-Cooled Scroll Compressor for Electric Bus

April 02, 2018

Continuing development of its patented liquid-cooled scroll technology, Air Squared has completed a custom scroll compressor for an electric bus application. The application required an oil-free air compressor capable of delivering 350 lpm v at 10.5 barg with nominal sound levels below 50 dB(A). With growing populations in urban centers around the world, cities looking […]

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Extremely Quiet Miniature Compressor for Medical Applications

March 30, 2018

The low-cost natural gas compressor development funded by Advanced Research Projects Agency – Energy (ARPA-E) is already paying dividends for future standard scroll compressor offerings. With successful development of the P05H012A-BLDC-C, the unit is likely to be the first production-ready model utilizing design and manufacturing technology learned from the government-funded cost reduction campaign. The compressor […]

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Semi-Hermetic Scroll Compressor for CO2 Collection

March 08, 2018

The semi-hermetic P19H038A-BLDC-SH is adopted from a non-sealed scroll compressor of similar design that is used onboard commercial airliners. The unit was modified to compress CO2 with minimal leakage and contamination of the working fluid and is part of an SBIR Phase I project awarded to Air Squared to develop scroll solutions that support ISRU […]

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Compact Oil-Free Scroll Compressor for Medical Devices

March 02, 2017

In 2001, Air Squared released the P11H012A-BLDC-C scroll compressor for use in portable medical oxygen concentrators. The small-scale pump quickly became a flagship product for Air Squared, being integrated into additional medical applications across the globe. After more than fifteen years in service, the P11H012A-BLDC-C will be replaced by the P07H015A-BLDC-C scroll compressor. The P07H015A-BLDC-C […]

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High-Pressure Scroll Natural Gas Booster

December 02, 2016

The P20H033A represents a milestone in scroll technology innovation, achieving the highest discharge pressure ever recorded on a scroll compressor. Using a volume ratio of 1.3, the compressor is engineered to boost natural gas from 110 bara to 113 bara. The heavy-duty design operates 100% oil-free and displaces 100 cm3/ Rev. at a max. running […]

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High-Capacity Scroll Compressor for Fuel Cell Applications

November 09, 2016

Growing in unison with the international alternative energy industry, Air Squared has become the transportation fuel cell standard through the development of their largest production scroll compressor, the P34H080A-BLDC. Capable of delivering up to 1,850 lpmv, the P34H080A-BLDC provides reliable oil-free air for transportation fuel cell stacks. Design Specifications Discharge Pressure: 1.8 barg Max Volume […]

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Two-Stage Semi-Hermetic Compressor for Aerospace

July 28, 2016

In early 2016, Air Squared was awarded a contract from Jet Propulsion Laboratory (JPL) to develop a semi-hermetic scroll compressor that is capable of boosting Mars atmospheric pressure to match atmospheric pressure on Earth (7 Torr to 760 Torr). The compressor is part of the Mars Oxygen ISRU Experiment (MOXIE) technology demonstration experiment for the […]

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Semi-Hermetic Scroll Compressor for Mars 2020 Mission

June 27, 2016

In early 2016, Air Squared was awarded a contract from Jet Propulsion Laboratory (JPL) to develop a semi-hermetic scroll compressor that is capable of boosting Mars atmospheric pressure to match atmospheric pressure on Earth (7 Torr to 760 Torr). The compressor is part of the Mars Oxygen ISRU Experiment (MOXIE) technology demonstration experiment for the […]

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Liquid-Cooled Scroll Compressor with Integrated Motor for Fuel Cell Vehicles

January 22, 2016

Fuel cell applications require oil-free air to prevent contamination of the fuel cell stack. When a major automotive company approached Air Squared in search of an oil-free air compressor, they knew they would find the compact, reliable, efficient, and oil-free product needed for a fuel cell-powered vehicle. Providing 700 SLPM of air at 3 barg, […]

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Compact High-Pressure Scroll Compressor

January 15, 2015

Designed for a cryogenic medical application with a small space envelope, the compact P09H015A-BLDC-SH is intended to boost Argon from 100 bara to over 115 bara, at a relatively low volume flow rate. While Air Squared has several high-pressure scroll compressors, the P09H015A-BLDC-SH represents the first to have high-pressure capability in a very compact and […]

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Semi-Hermetic Scroll Compressor with Integrated Water-Cooling

January 02, 2015

Designed for an industrial gas processing application with high-sensitivity to any contamination of the working fluid, the oil-free P32H080A-AC-SH-WC is capable of compressing helium from 1 bara to 3.5 bara at a flow rate of 1,500 lpmv. The novel scroll compressor incorporates two innovations patented by Air Squared – semi-hermetic design using a magnetic coupling […]

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Spinning Scroll Compressor for H2 Recirculation

April 03, 2014

The P21H050A-BLDC-SH-SS is designed to boost 180 ºC, 100% humid hydrogen from 20 bara to 20.5 bara. Used to recirculate high-temperature hydrogen for a solid oxide fuel cell (SOFC) system in a weight-sensitive aerospace application, this innovative spinning scroll compressor provides 375 lpmv of hydrogen to the anode side of the SOFC in a package […]

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Small-Scale Scroll Cryogenic Pump

November 23, 2013

Developed for NASA, the pump is designed to move low-temperature liquids efficiently in zero gravity cryogenic control devices. With numerous aerospace applications, the design can be used as a fuel pump for liquid hydrogen-fueled aircraft. The scroll pump was developed as part of a Phase I Small Business Innovation Research grant (SBIR). The SBIR asked for […]

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Miniature Medical Scroll Compressor

September 01, 2013

For use in a portable nebulizer application, the compact P08H014A-BLDC is the first oil-free scroll compressor to incorporate a supporting piston to load the orbiting scroll against the fixed scroll. Designed for a small footprint and silent operation, the patented innovation will help reduce cost in volume production. Weighing just 375 grams with brushless motor, […]

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Lightweight, Compact, Oil-free Scroll Compressor

February 07, 2013

Developed for mobile applications, the oil-free P24H056A-BLDC features a compact and lightweight design, capable of delivering up to 600 lpmv of air at 0.7 barg. The unit is ideal for mobile fuel cell and medical applications. The efficient compressor employs a traditional orbiting scroll design, but can operate at speeds over 4,000 RPM. While most […]

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Fuel Cell Hydrogen Recirculation Pump

November 01, 2011

Weighing just 2.2 kg, the compact P16H034C-BLDC-SH delivers 100 lpm of hydrogen, with a 0.25 bard pressure rise. The semi-hermetic unit is designed to recirculate humidified hydrogen in fuel-cell-powered fork lifts. The goal of the project was to develop a semi-hermetic hydrogen pump that offers improved reliability and efficiency over diaphragm pumps currently used in […]

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P19H38N5.25 5 HP Scroll Compressor

March 01, 2010

As the largest Air Squared scroll compressor to date, the 5 hp P19H38N5.25 is capable of 500 lpm at 125 psig. The AC powered unit features innovative integrated cooling.

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Miniature Scroll Compressor for Circuit Cooling

April 12, 2009

Designed for Intel for use in circuit cooling, the miniature scroll compressor is the first to incorporate a loaded piston behind the orbiting scroll and patented delayed porting. The orbiting scroll design eliminates the need for dynamic seals and extends duty life. At just 2 inches in diameter and 2.75 inches long, the mini compressor […]

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Durable and Compact Scroll Compressor for Commercial Aerospace

March 08, 2009

Unique among scroll technology solutions for Air Squared, the P19H038A-BLDC is purpose-built to deliver maximum performance per kilogram in a minimal footprint, with the unique needs of aerospace applications considered throughout the entire design process. Intended for integration in a potable water supply system, the P19H038A-BLDC represents the state-of-the-art compressor solution for commercial aerospace applications. […]

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High-Pressure Water-Cooled Compressor

September 01, 2007

The world’s first water-cooled scroll unit was designed for the US Army to fit inside a military vehicle with a small envelope and no available air cooling. The unit is water-cooled using a bellows to transfer coolant around the orbiting scroll. The patented design uses a BLDC motor and delivers approximately 350 lpm of air […]

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